JavaScript & Node.js course for Testers, QA and SDETs - 2026

Create your first node project by setting up a workspace and initializing npm to generate package.json. Write a hello world program with console.log and run it using node in terminal.

Learn how comments in DA script improve readability and are ignored by the interpreter. Cover three command types: single-line, multi-line, and aspect, with their syntax and a practical demo.

Explore how JavaScript represents literals for string, number, boolean, object, array, regular expression, undefined, and null, and learn string templates, concatenation, and basic literal syntax.

Learn how to use the typeof operator in JavaScript to identify runtime data types, explore string, number, boolean, object, array, undefined, and null, and print results with template literals.

Explore falsy values and truthiness in JavaScript, including false, undefined, null, 0, empty string, and NaN, and understand boolean and numeric contexts to validate data in tests.

Convert data types using inbuilt global functions to parse strings into numbers and stringify numbers back to strings, using parseInt, parseFloat, Number(), plus operator, and toString.

Explore how to use logical operators in test automation, including and (&&), or (||), and not (!) in conditionals and defaults, and validate strings with typeof and length checks.

Understand the logical not operator and truthy/falsy values, including false, undefined, null, 0, not a number, and empty string, to validate data and control if conditions in functions.

Apply the logical or operator to set a default browser value, using the left value when truthy and the right value when falsy, demonstrated with Chrome and Firefox.

Learn how conditional statements work, distinguish assignment from comparison, and master if-else logic, nested conditions, and Python-style elif, with boolean evaluation and false values.

Explore the if-not condition to validate data and throw errors for invalid values like undefined or empty strings. See how the message 'no valid data provided' signals an error.

Master nested if conditions with multiple branches and an else block where one path runs. Apply to test automation scenarios, handling system errors, business validation failures, data validation, and retries.

Offers a simple standard for loop example showing initial value, condition, and increment to print 0–10 with console.log, and demonstrates decrementing from 10 to 1.

Learn how to iterate arrays with the forEach method using a callback or arrow function. Access values, indices, and the entire array during iteration.

Learn to extract year, month, and day from a string using JavaScript's slice method, preferred over substring, with start and end indices, optional parameters, and negative indexing.

Extract the application number from a log message by using indexOf to locate the left boundary, lastIndexOf for the right boundary, and slice with start+1 and end to obtain value.

Learn how backslashes act as escape characters in strings, enabling newline, tab, and literal quotes. Discover when a backslash is skipped or when it creates a valid escape sequence.

Explore anonymous functions and function expressions in JavaScript, and learn how callbacks work, how names can be assigned to variables, and the scope rules.

Learn how JavaScript function parameters work: default values, optional and undefined arguments, and handling multiple inputs such as full names, or an object or function passed as a parameter.

Explore the return statement across five scenarios—primitive values, expressions, objects, functions (including anonymous), and early returns via conditional logic, with notes on promises and callbacks.